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Clyne Valley Shaft Mounds is a post-medieval and modern coal mine protected as a scheduled monument by Cadw under reference GM455. Located in Wales, the site preserves the landscape legacy of anthracite extraction from the rich coal seams of the South Wales coalfield. The underlying Pennine and South Wales Middle Coal Measures Formation, laid down during the Moscovian age, contains alternating layers of mudstone, siltstone and sandstone interbedded with coal and ironstone—the geological foundation that drove industrial development in the region.
The shaft mounds themselves are surface features created by the removal and tipping of spoil during mining operations. These earthworks record the intensive labour and mechanical processes of coal extraction that transformed the Welsh valleys from the post-medieval period onwards. The ferricrete deposits within the surrounding bedrock testify to the iron-rich nature of these coal measures, which supported both coal and iron industries in South Wales.
The monument survives as a material record of Wales's industrial heritage, documenting the relationship between local geology and economic activity. The preservation of these shaft mounds contributes to understanding the scale and character of coal mining in the region and its lasting impact on the physical landscape.
Clyne Valley Shaft Mounds is a scheduled monument protected by Cadw under reference GM455. View the official record →
Clyne Valley Shaft Mounds is a post-medieval and modern coal mine protected as a scheduled monument by Cadw under reference GM455.
Clyne Valley Shaft Mounds dates from the post medieval/modern period, and is classified as a coal mine. It is one of over 32,000 scheduled monuments protected across the UK.
Clyne Valley Shaft Mounds is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is GM455.
Several scheduled monuments lie within 10 km, including Ynys Pit & Leat (0.4 km), Clyne Wood Colliery Steam Winding Machine (0.6 km), Clyne Wood Coal Level (0.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Clyne Valley Shaft Mounds's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Clyne Valley Shaft Mounds stands on Pennine Middle Coal Measures Formation And South Wales Middle Coal Measures Formation (Undifferentiated), bedrock that formed in the Moscovian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.